Positioning device for drilling cuts in shafts and sumps in mine sinking work



, 2,884,701 R DRILLING cu'rs IN SHAFTS y 1959 w. DUDA POSITIONING DEVICE F0 AND SUMPS IN MINE SINKING WORK Filed June 13, 1956 .lm enfon' W/LHELM UDA 024.

A TT'OR United States Pate POSITIONING DEVICE FOR DRILLING CUTS IN SHAFTS AND SUNIPS IN MINE SINKING WORK Wilhelm Duda, Osnabmck, Germany Application June 13, 1956, Serial No. 591,134 Claims priority, application Germany June 14, 1955 8 Claims. (Cl. 33-189) My invention relates to a positioning device for drilling cuts in shafts and sumps in mine sinking and similar work. My new device comprises a support or post centered in the pilot hole and one or more extendable jib arms attached thereto in such manner that they may be adjusted and secured in various radial positions and at difierent angles of inclination relative to the axis of said post.

My new device permits a controlled drilling of accurately placed cuts in horizontal preparatory work in mines up to a depth of about 20 feet. Contrary thereto with known devices only cuts up to an average depth of about 7 feet could be drilled and the drilling was uncontrolled and dependent on the judgment and guess of the worker. My device provides a safe guide for the drilling bar penetrating the rock and assures an accurate location of the drill holes at a predetermined point at the desired distance from the pilot hole. My device prevents unsuccessful shot falls which hitherto were almost exclusively due to inaccurately drilled cuts.

The said and other objects of my invention will be more fully understood from the following specification when read with the accompanying drawing illustrating one embodiment of my new device. In the drawing Fig. 1 is a partial side view partly in section of the device according to the invention.

Fig. 2 is a diagrammatic top view showing the various points at which the drill holes are to be started, and

Fig. 3 is a partial top view showing the articulation of the jib arms to the centering post, taken on the line III-III of Fig. 1.

Figs. 4 and 5 are top views of parts of Fig. 1, looking in the direction of arrows IV and V respectively.

In Fig. 1, a hole 1 which is also referred to as the pilot hole, is drilled at the place where the shaft or post is to be sunk. Such post 2 is inserted up to approximately half its length into the pilot hole leaving its upper portion 4 outside said hole 1. The depth to which it is inserted is limited by a cone or conically thickened portion 3 on said post 2. The shaft or post 2 with its cone 3 is driven securely into the pilot hole 1 by light blows. The upper portion 4 of said post 2 carries preferably four pairs of jib arms 5 and 6 said ports being arranged at 90 relatively to each other and, the two arms of each pair being arranged one above the other in a plane passing through the axis of post 2. Each jib arm 5 and 6 consists of two telescoping components namely of a tubular portion 13, 13', respectively, and a rodlike extension 16, 16, respectively. The said tubular portions 13, 13, of the arms 5 and 6 are pivotally mounted on the upper post portion 4 for example by means of a fork 7 whose legs 8 are connected pivotally to the post 2 and bear against an index wheel 9, such as a toothed wheel, which is fixedly mounted on the post 2 between said legs. The index wheels 9, arranged one above the other are so fixed to upper post portion 4 that their index divisions 12 are in alignment with each other.

Patented May 5, 1.959

Each of the legs. 8 is provided with an opening 10 through which a wedge 11 can be introduced, to engage the index indentations or tooth spaces 12 of the index wheels 9, thus locking the jib arms 5 and 6 in their radial angular position. The outer end. of the fork 7 which is opposite the legs is hingedly connected by a horizontal pin 14 to the tubular jib portion 13 or 13', resepctively. These jib portions 13 or. 13' are provided with equidistantly spaced holes 15 and 15' which are directed perpendicularly to the hinge pin 14. The extensions 16 or 16, inserted into the jib sleeves 13 and 13 respectively, comprise, at their ends facing the centering shaft 2 a hole 17 which has the same diameter as the holes 15, 15' formed in the tubular jib member 13, 13', respectively. A pin 18 can be inserted selectively through one of the holes 15 or 15' into said members 13, 13' and through the hole 17 in the extension member 16 or 16', thus locking these telescoping components together. By changing the position of the pin 18 as desired, the jib arms 5 and 6 can be lengthened or shortened. The two jib arms 5 and 6 are connected by strutting 19 which is arranged parallel to the post 2 and is connected hingedly to the tubular jib members 13 and 13' permitting its displacement in longitudinal direction. The strutting 19 serves to keep the jib arms 5 and 6 spaced parallel. The outer end of the extension member 16 of the upper jib arm 6 is forked at 20, as shown in Fig. 4 and the free end 21 of the slide member 16 of the lower jib arm 5 is provided with an eye 21 as shown in Fig. 5. The drilling bar 20 is pushed through the eye 21 of the lower jib arm 5 and introduced into the fork 20 of the upper jib arm 6, and in this way the angle of inclination of the drilling bar 20 relatively to the centering post 2 is determined at will be different lengths of the jib arms 5 and 6. The upper jib arm 6 differs from the lower arm 5 substantially only by its somewhatv greater length and by the correction scale which is provided thereon and which Will be described in detail hereinafter.

The locking holes 15 and 15' provided in the tubular components 13, 13' of the sleeve arms 5 and 6 respectively are spaced at uniform distances which represent units of measurement serving to determine the angle of inclination of the drilling bar 21 and thus the depth of hole. For this purpose said locking holes are provided with markings which permit to predetermine and to adjust the angle of inclination of the drilling bar 26.

If, when working with the device, the arms 5 and 6 take up a position to which they had been swung upwards or downwards about the hinge pins 14, the lengths of the jib arms 5 and 6 must be corrected correspondingly in order to ensure that the drill hole is at the correct angle of inclination and at the prescribed distance from the pilot hole, since the said markings relate to the horizontal position of the arms. For this purpose a pointer 22 is provided on the fork 7 of the upper arm 6, and the said pointer co-operates with a scale 23 which is fixed to the jib member 13' and pivots therewith. The scale 23 indicates the corresponding correction of the locking holes 15 and 15' in the jib members 13, 13' and of the holes 17 in the extension members 16 and 16' respectively.

The device is operated as follows:

After the post 2 has been centered in the pilot hole 1, the arms 5 and 6 are locked in their radial angular position to the index wheels 9, by inserting the wedges 11 into the openings 10 of the forks 7. First, holes are formed at a distance A (see Fig. 2) from the pilot hole 1. The angle of inclination is determined in advance according to particular conditions, by appropriate adjustment of the length of the arms 5 and 6. After these holes have been drilled all the pairs of arms 5 and 6 are pivoted by about 45, and are locked in this radial angular position. The arms 5 and 6 are then adjusted to a predetermined relatively large distance B from the pilot hole 1 and to the desired angle of inclination, and four additional holes are drilled. This operation is repeated until all the necessary holes have been drilled for receiving explosive charges in the cut. In addition to the drill holes extending at an angle relatively to the pilot hole, a considerable number of blast holes have also to be drilled perpendicularly to the depth of the cut depending on the diameter of the shaft. The cut provides the space for the expansion of the rock at the following shots, the pilot hole being destroyed at the same time as the first four shot holes. All the holes are thus charged and are fired in chronological sequence at predetermined intervals. The rock which is blown oil? is removed and the pilot hole and the shot holes are drilled again, and the previously described operation is repeated. In this way the shaft is driven deeper in stages.

Owing to the fixed guiding of the drilling apparatus, the invention makes it possible to drill to substantially greater depths than has been possible hitherto with holes drilled by hand without controlling guidance. With my new device drilling operations can be carried out by unskilled personnel and in a substantially shorter time and with much greater accuracy than has been possible before.

The invention is not in any way limited to the constructional example illustrated, many modifications being conceivable without departing from the principles of the invention. Thus for example it is possible to provide only one index wheel instead of two, the forks 7 of the lower and upper arms 5 and 6 possibly being connected by a tube which is fitted over the shaft end 4. It is also possible for the lengths of the arms to be adjustable, not telescopically, but in another manner. The slide members 16 and 16' can also be unlocked from the sleeve arms 13 and 13' in another way than that illustrated in the drawings.

The invention is not in any way limited to sinking mine shafts; it is equally possible to use it in tunnelling or other work.

Although one form of the invention has been shown and described by way of illustration, it will be well understood that it may be constructed in various other embodiments which come within the scope of the appended claims.

What I claim as my invention is:

1. Positioning device for drilling cuts in shafts and sumps in mine sinking operations comprising a post adapted to be seated in a central pilot hole; at least one pair of an upper and a lower jib arm extending from said post in spaced relation for a coordinated swing movement in planes passing through the axis of said post; each of said arms being independently and adjustindicate the angular position of said supports and arms relative to the post; securing means to fix the position of said forklike support relative to the post; a joint between the free end of each forklike support and its adjoining jib arm to permit the said swing movement thereof; and second index means at least on one joint to show the inclination of the arms.

2. A device according to claim 1 wherein the said angle indicating index means consist of a spur wheel fixed to said post and the said securing means of a locking bolt seated in the legs of the forklike support and engaging said spur wheel.

3. A device according to claim 1 wherein each arm is composed of two telescoping components and including means to secure the said components in adjusted relative positions.

4. A device according to claim 1 wherein in each pair of jib arms the upper arm is forked at its free end to receive the drilling bar and the lower arm is provided at its free end with an eye to rotatably hold the drilling bar.

5. Positioning device for drilling cuts in shafts and sumps in mine sinking operations comprising a post adapted to be seated in a central pilot hole; at least one pair of an upper and a lower jib arm extending from said post in spaced relation for a coordinated swing move ment in planes passing through the axis of said post; each of said arms being independently and adjustably extendable; means jointedly connecting the arms of each pair to insure their coordinated swing movement; a support for each of said arms rotatably mounted on said post; angle indicating index means associated with said post to indicate the angular position of said supports and arms relative to the post; securing means to fix the position of said supports relative to the post; a joint between each support and its adjoining jib arm to permit the said swing movement thereof; and second index means at least on one joint to show the inclination of the arms.

6. A device according to claim 5 wherein the said angle indicating means consists of a spur wheel fixed to said post and the said securing means of a locking member engaging each support and said spur wheel.

7. A device according to claim 5 wherein each arm is composed of two telescoping components and including means to secure the said components in adjusted relative positions.

8. A device according to claim 5 wherein in each pair of jib arms the upper arm is forked at its free end to receive the drilling bar and the lower arm is provided at its free end with an eye to rotatably hold the drilling bar.

References Cited in the file of this patent UNITED STATES PATENTS 490,617 Taylor Jan. 24, 1893 812,774- Srnith Feb. 13, 1906 1,203,527 Gantt Oct. 31, 1916 2,309,777 Kowalske Feb. 2, 1943 FOREIGN PATENTS 160,134 Australia Dec. 6, 1954 925,704 Germany Mar. 28, 1955 

